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Sulfoaluminate-Portland cement composite system additive, fast-hardening early-strength concrete and preparation method of concrete

A technology of portland cement and sulfoaluminate, applied in the direction of organic chemistry, can solve the problems that it is difficult to show good adaptability of the binary composite system, so as to enhance the high plastic retention effect, avoid the freezing of water at low temperature, increase the Effect of Calcium Solubility and System Alkalinity

Active Publication Date: 2016-08-24
HUBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional admixtures are only suitable for sulphoaluminate water systems or Portland cement systems, and it is difficult to show good adaptability to binary composite systems

Method used

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  • Sulfoaluminate-Portland cement composite system additive, fast-hardening early-strength concrete and preparation method of concrete
  • Sulfoaluminate-Portland cement composite system additive, fast-hardening early-strength concrete and preparation method of concrete
  • Sulfoaluminate-Portland cement composite system additive, fast-hardening early-strength concrete and preparation method of concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0033] Sulphoaluminate-Portland cement composite system admixture

[0034] The mass percentages of each component in the admixture of the sulphoaluminate-Portland cement composite system described in Examples 1-3 are shown in Table 1, respectively. The structural formula of the water reducing agent used is:

[0035]

[0036] Wherein, m=48; n=44; p=22; the molecular weight of the water reducer is controlled to be 42000, and its preparation method comprises the following steps: 1) adding crotonic acid and polyethylene glycol butyl ether to the reaction in a molar ratio of 1:0.8 In the kettle A, add 4-dimethylaminopyridine accounting for 1.5% of the total mass of the solution in the reactor A and hydroquinone accounting for 0.3% of the total mass of the solution in the reactor A, stir and heat to 90° C., and keep warm for 6 hours to obtain product A ; Methylene succinic acid and polyvinyl alcohol are added in the reaction kettle B at a molar ratio of 1:1.2, and the concentrat...

Embodiment 4-6

[0049] Sulfoaluminate-Portland cement-based rapid-hardening early-strength concrete

[0050] The sulfoaluminate-portland cement composite system admixture prepared in Example 1 is used to prepare sulfoaluminate-portland cement-based rapid-hardening early-strength concrete. The mix ratio is shown in Table 4, and the performance test results of the concrete are shown in Table 5. Among them, sulfoaluminate-portland cement is made by mixing sulfoaluminate cement (SAC) and portland cement (POC). The specific mixing ratio is shown in Table 4.

[0051] The mixing ratio (kg / m3) of the rapid-hardening early-strength concrete prepared in table 4 embodiment 4~6 3 )

[0052]

[0053] The performance testing result of the rapid-hardening early-strength concrete prepared by table 5 embodiment 4-6

[0054]

[0055] As can be seen from Table 5, the concrete prepared by the sulphoaluminate-Portland cement composite system admixture prepared in Example 1, along with the increase of its ...

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Abstract

The invention provides a sulfoaluminate-Portland cement composite system additive and prepared sulfoaluminate-Portland cement-based fast-hardening early-strength concrete. The sulfoaluminate-Portland cement composite system additive is prepared from components in percentage by mass as follows: 70%-78% of a water reducing agent, 1.2%-2.5% of an early-strength agent, 18%-25% of a retarder and 2%-4% of an anti-freezing agent. The sulfoaluminate-Portland cement composite system additive can significantly improve the initial flow performance of the sulfoaluminate-Portland cement-based concrete, delay the setting time of a cement composite system, reduce the slump loss and effectively resolve the contradiction between liquidity and early strength and has composite effects of water reduction, delayed coagulation, early strength and the like, and a related preparation method is simple and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a sulphoaluminate-portland cement composite system admixture, rapid-hardening and early-strength concrete and a preparation method thereof. Background technique [0002] Ordinary sulphoaluminate cement (SAC) clinker is calcined at 1300-1400°C with proper composition of limestone, bauxite and gypsum as raw materials. The main mineral of clinker is C 4 A 3 S and C 2 S, and a small amount of free gypsum and iron phase. C 4 A 3 S minerals make sulfoaluminate cement have excellent characteristics such as early strength, high strength, impermeability, frost resistance, corrosion resistance and low alkalinity, and at the same time C 4 A 3 The hydration activity of S is very high, and a large amount of ettringite (AFt), C-S-H and aluminum hydroxide (AH 3 ) gel, so that the cement can obtain higher early strength, and the 1d and 3d strength can reach 60-70% of the 28d ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C04B28/06C08F222/20C08F220/28C08F212/14C07C69/732
CPCC04B28/06C04B40/0039C07C69/732C08F222/1006C08F222/1063C04B24/22C04B24/06C04B22/10C04B24/122C04B2103/601C04B7/02C04B14/02C04B14/068C04B14/48C04B2103/0068C08F220/285C08F212/14
Inventor 黄绍龙卞周宏黄修林黄小霞苗强徐波
Owner HUBEI UNIV
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